Index: /issm/trunk-jpl/src/c/objects/Constraints/SpcTransient.cpp
===================================================================
--- /issm/trunk-jpl/src/c/objects/Constraints/SpcTransient.cpp	(revision 12527)
+++ /issm/trunk-jpl/src/c/objects/Constraints/SpcTransient.cpp	(revision 12528)
@@ -149,5 +149,5 @@
 
 		/*Apply or relax constraint: */
-		if(isnan(value)){
+		if(xIsNan<IssmDouble>(value)){
 			node->RelaxConstraint(dof);
 		}